Assertion: NAD+ is the most versatile electron acceptor in cellular respiration and functions in several of redox steps during the breakdown of glucose.
Reason: As an electron acceptor, NAD+ functions as an oxidizing agent during respiration.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
Assertion: The reaction in glycolysis, catalyzed by the enzyme phosphofructokinase, is a key regulatory point and also a rate limiting step.
Reason: The reaction is essentially irreversible.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
Assertion: Arsenate is the uncoupler of glycolysis.
Reason: Arsenate is an inhibitor of phosphoglycerate mutase.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
Assertion: The carbons lost as in the Krebs cycle come directly from acetyl CoA.
Reason: These carbons are lost always and cannot be put to any use.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
Assertion: Cyanide poisoning is a form of histotoxic hypoxia.
Reason: Cyanide binds to iron of cytochrome c oxidase and thus prevents binding of oxygen to hemoglobin.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
Assertion: Homolactic fermentation (producing only lactic acid) is the simplest type of fermentation.
Reason: It is one of the only respiration processes to not produce a gas as a byproduct.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
Assertion: When a glucose fed yeast is transferred from aerobic to anaerobic medium its rate of glucose consumption decreases.
Reason: It starts metabolizing lactose and stops using glucose in anaerobic conditions.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
Based on the information given in Section 14.3 of your NCERT textbook, can you identify the chemical reaction catalyzed by the enzyme alcohol dehydrogenase?
1.
2.
3.
4. None of these
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Oxidation of organic compounds by molecular oxygen results in the production of carbon dioxide and water and releases free energy. This is because:
1.High energy covalent bonds in organic molecules are broken to produce weaker covalent bonds in water and carbon dioxide.
2. Electrons are being moved from atoms that have a lower affinity for electrons to atoms with a higher affinity for electrons.
3.The electrons in water and carbon dioxide have higher potential energy than the electrons in organic compounds.
4. The covalent bonds in organic molecules are unstable and stable in water and oxygen.
Consider the steps of glycolysis given in the diagram:
What is true about reaction 1?
I. Hexokinase is a transferase
II. It acts to keep the glucose concentration low
III. It blocks the glucose from leaking out
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III